Algebra Examples

$f (x) = 2 x + 8$ $g (x) = x^{4} (g^{o} f) (- 3)$

Step 1

Set up the composite result function.

$g (f (x))$

Step 2

Evaluate $g (2 x + 8)$ by substituting in the value of $f$ into $g$ .

$g (2 x + 8) = {(2 x + 8)}^{4} (g^{o} f) (- 3)$

Step 3

Use the Binomial Theorem.

$g (2 x + 8) = ({(2 x)}^{4} + 4 {(2 x)}^{3} \cdot 8 + 6 {(2 x)}^{2} \cdot 8^{2} + 4 (2 x) \cdot 8^{3} + 8^{4}) (g^{o} f) \cdot - 3$

Step 4

Simplify terms.

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Step 4.1

Simplify each term.

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Step 4.1.1

Apply the product rule to $2 x$ .

$g (2 x + 8) = (2^{4} x^{4} + 4 {(2 x)}^{3} \cdot 8 + 6 {(2 x)}^{2} \cdot 8^{2} + 4 (2 x) \cdot 8^{3} + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.2

Raise $2$ to the power of $4$ .

$g (2 x + 8) = (16 x^{4} + 4 {(2 x)}^{3} \cdot 8 + 6 {(2 x)}^{2} \cdot 8^{2} + 4 (2 x) \cdot 8^{3} + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.3

Apply the product rule to $2 x$ .

$g (2 x + 8) = (16 x^{4} + 4 (2^{3} x^{3}) \cdot 8 + 6 {(2 x)}^{2} \cdot 8^{2} + 4 (2 x) \cdot 8^{3} + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.4

Raise $2$ to the power of $3$ .

$g (2 x + 8) = (16 x^{4} + 4 (8 x^{3}) \cdot 8 + 6 {(2 x)}^{2} \cdot 8^{2} + 4 (2 x) \cdot 8^{3} + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.5

Multiply $8$ by $4$ .

$g (2 x + 8) = (16 x^{4} + 32 x^{3} \cdot 8 + 6 {(2 x)}^{2} \cdot 8^{2} + 4 (2 x) \cdot 8^{3} + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.6

Multiply $8$ by $32$ .

$g (2 x + 8) = (16 x^{4} + 256 x^{3} + 6 {(2 x)}^{2} \cdot 8^{2} + 4 (2 x) \cdot 8^{3} + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.7

Apply the product rule to $2 x$ .

$g (2 x + 8) = (16 x^{4} + 256 x^{3} + 6 (2^{2} x^{2}) \cdot 8^{2} + 4 (2 x) \cdot 8^{3} + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.8

Raise $2$ to the power of $2$ .

$g (2 x + 8) = (16 x^{4} + 256 x^{3} + 6 (4 x^{2}) \cdot 8^{2} + 4 (2 x) \cdot 8^{3} + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.9

Multiply $4$ by $6$ .

$g (2 x + 8) = (16 x^{4} + 256 x^{3} + 24 x^{2} \cdot 8^{2} + 4 (2 x) \cdot 8^{3} + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.10

Raise $8$ to the power of $2$ .

$g (2 x + 8) = (16 x^{4} + 256 x^{3} + 24 x^{2} \cdot 64 + 4 (2 x) \cdot 8^{3} + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.11

Multiply $64$ by $24$ .

$g (2 x + 8) = (16 x^{4} + 256 x^{3} + 1536 x^{2} + 4 (2 x) \cdot 8^{3} + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.12

Multiply $2$ by $4$ .

$g (2 x + 8) = (16 x^{4} + 256 x^{3} + 1536 x^{2} + 8 x \cdot 8^{3} + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.13

Multiply $8$ by $8^{3}$ by adding the exponents.

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Step 4.1.13.1

Move $8^{3}$ .

$g (2 x + 8) = (16 x^{4} + 256 x^{3} + 1536 x^{2} + 8^{3} \cdot (8 x) + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.13.2

Multiply $8^{3}$ by $8$ .

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Step 4.1.13.2.1

Raise $8$ to the power of $1$ .

$g (2 x + 8) = (16 x^{4} + 256 x^{3} + 1536 x^{2} + 8^{3} \cdot (8 x) + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.13.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$g (2 x + 8) = (16 x^{4} + 256 x^{3} + 1536 x^{2} + 8^{3 + 1} x + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.13.3

Add $3$ and $1$ .

$g (2 x + 8) = (16 x^{4} + 256 x^{3} + 1536 x^{2} + 8^{4} x + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.14

Raise $8$ to the power of $4$ .

$g (2 x + 8) = (16 x^{4} + 256 x^{3} + 1536 x^{2} + 4096 x + 8^{4}) (g^{o} f) \cdot - 3$

Step 4.1.15

Raise $8$ to the power of $4$ .

$g (2 x + 8) = (16 x^{4} + 256 x^{3} + 1536 x^{2} + 4096 x + 4096) (g^{o} f) \cdot - 3$

Step 4.2

Apply the distributive property.

$g (2 x + 8) = (16 x^{4} (g^{o} f) + 256 x^{3} (g^{o} f) + 1536 x^{2} (g^{o} f) + 4096 x (g^{o} f) + 4096 (g^{o} f)) \cdot - 3$

Step 5

Remove parentheses.

$g (2 x + 8) = (16 x^{4} g^{o} f + 256 x^{3} g^{o} f + 1536 x^{2} g^{o} f + 4096 x g^{o} f + 4096 g^{o} f) \cdot - 3$

Step 6

Apply the distributive property.

$g (2 x + 8) = 16 x^{4} g^{o} f \cdot - 3 + 256 x^{3} g^{o} f \cdot - 3 + 1536 x^{2} g^{o} f \cdot - 3 + 4096 x g^{o} f \cdot - 3 + 4096 g^{o} f \cdot - 3$

Step 7

Simplify.

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Step 7.1

Multiply $- 3$ by $16$ .

$g (2 x + 8) = - 48 x^{4} g^{o} f + 256 x^{3} g^{o} f \cdot - 3 + 1536 x^{2} g^{o} f \cdot - 3 + 4096 x g^{o} f \cdot - 3 + 4096 g^{o} f \cdot - 3$

Step 7.2

Multiply $- 3$ by $256$ .

$g (2 x + 8) = - 48 x^{4} g^{o} f - 768 x^{3} g^{o} f + 1536 x^{2} g^{o} f \cdot - 3 + 4096 x g^{o} f \cdot - 3 + 4096 g^{o} f \cdot - 3$

Step 7.3

Multiply $- 3$ by $1536$ .

$g (2 x + 8) = - 48 x^{4} g^{o} f - 768 x^{3} g^{o} f - 4608 x^{2} g^{o} f + 4096 x g^{o} f \cdot - 3 + 4096 g^{o} f \cdot - 3$

Step 7.4

Multiply $- 3$ by $4096$ .

$g (2 x + 8) = - 48 x^{4} g^{o} f - 768 x^{3} g^{o} f - 4608 x^{2} g^{o} f - 12288 x g^{o} f + 4096 g^{o} f \cdot - 3$

Step 7.5

Multiply $- 3$ by $4096$ .

$g (2 x + 8) = - 48 x^{4} g^{o} f - 768 x^{3} g^{o} f - 4608 x^{2} g^{o} f - 12288 x g^{o} f - 12288 g^{o} f$

Step 8

Reorder factors in $- 48 x^{4} g^{o} f - 768 x^{3} g^{o} f - 4608 x^{2} g^{o} f - 12288 x g^{o} f - 12288 g^{o} f$ .

$g (2 x + 8) = - 48 x^{4} f g^{o} - 768 x^{3} f g^{o} - 4608 x^{2} f g^{o} - 12288 x f g^{o} - 12288 f g^{o}$

Step 9

Move $x^{4}$ .

$g (2 x + 8) = - 48 f g^{o} x^{4} - 768 x^{3} f g^{o} - 4608 x^{2} f g^{o} - 12288 x f g^{o} - 12288 f g^{o}$

Step 10

Move $x^{3}$ .

$g (2 x + 8) = - 48 f g^{o} x^{4} - 768 f g^{o} x^{3} - 4608 x^{2} f g^{o} - 12288 x f g^{o} - 12288 f g^{o}$

Step 11

Move $x^{2}$ .

$g (2 x + 8) = - 48 f g^{o} x^{4} - 768 f g^{o} x^{3} - 4608 f g^{o} x^{2} - 12288 x f g^{o} - 12288 f g^{o}$

Step 12

Move $x$ .

$g (2 x + 8) = - 48 f g^{o} x^{4} - 768 f g^{o} x^{3} - 4608 f g^{o} x^{2} - 12288 f g^{o} x - 12288 f g^{o}$